Blazechan ran smoothest one everything.
Only momment when it got beat was with uploading webms compared to endchan.
But endchan lost royaly on everything else.
8chan worked ok but had hiccups(not anything major) with some files
endchan's percent counter broke while testing.
I also descovered that endchan can't do certain characters like '%' because it recognizes it as a float.

Overall, blazechan looks good.
And this site isn't even running the websocket update yet.

You guys should honestly remove the ability to edit your replies. It allows us to view what's really on people's minds without them backtracking or sugarcoating it. Also, we should implement 4chan /pol/-like ID's by default for, every board.